package demo1;

import java.util.Arrays;
import java.util.Comparator;

class Student implements Comparable<Student> {
    public String name;
    public int age;
    public int score;

    public Student(String name, int age, int score) {
        this.name = name;
        this.age = age;
        this.score = score;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", score=" + score +
                '}';
    }

    @Override
    public int compareTo(Student o) {
//        if(this.age > o.age) {
//            return 1;
//        }else if(this.age < o.age) {
//            return -1;
//        }else {
//            return 0;
//        }
        return this.age - o.age;
    }
}

//class Student {
//    public String name;
//    public int age;
//    public int score;
//
//    public Student(String name, int age, int score) {
//        this.name = name;
//        this.age = age;
//        this.score = score;
//    }
//
//    @Override
//    public String toString() {
//        return "Student{" +
//                "name='" + name + '\'' +
//                ", age=" + age +
//                ", score=" + score +
//                '}';
//    }
//
//}
class AgeComparator implements Comparator<Student> {

    @Override
    public int compare(Student o1, Student o2) {
        return o1.age - o2.age;
    }
}
class ScoreComparator implements Comparator<Student> {

    @Override
    public int compare(Student o1, Student o2) {
        return o1.score - o2.score;
    }
}
class NameComparator implements Comparator<Student> {

    @Override
    public int compare(Student o1, Student o2) {
        return o1.name.compareTo(o2.name);
    }
}
public class Test {
    public static void main(String[] args) {
        Student[] students = new Student[3];
        students[0] = new Student("zhangsan",10,19);
        students[1] = new Student("abc",8,78);
        students[2] = new Student("lisi",15,57);

        //比较器
        AgeComparator ageComparator = new AgeComparator();
        ScoreComparator scoreComparator = new ScoreComparator();
        NameComparator nameComparator = new NameComparator();


        //Arrays.sort(students,ageComparator);
        //Arrays.sort(students,scoreComparator);
        Arrays.sort(students,nameComparator);

        System.out.println(Arrays.toString(students));
    }

    public static void main1(String[] args) {
        Student[] students = new Student[3];
        students[0] = new Student("zhangsan",10,19);
        students[1] = new Student("abc",8,78);
        students[2] = new Student("lisi",15,57);
//        if(students[0].compareTo(students[1]) > 0) {
//            System.out.println("student[0] > student[1]");
//        }
        Arrays.sort(students);
        System.out.println(Arrays.toString(students));

    }
}
